Removable toothed gear



(No Model.)

D. NUTTALL. BE ABLE TOOTHED GEAR.

No. 449,493. Patented Mar. 31, 1891.

WITNESSES:

WW9 W FJ I NITED STATES PATENT ()rmon.

ROBERT D. NUTTALL, OF ALLEGHENY, PENNSYLVANIA.

REMOVABLE TOOTH ED GEAR.

SPECIFICATION forming part of Letters Patent No. 449,493, dated March 31, 1891.

Application filed November 19, 1890. $erial No. 371,951. (No model.)

To all whom it may concern:

Be it known that LROBERT D. NUTTALL, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented or discovered a new and useful Improvement in Removable Toothed Gears, of which the following is a specification.

In the accompanying drawings, which make part of this specification, Figure 1 is abroken section of awheel embodying my invention in side elevation, with part of the clamping-ring broken away. Fig. 2 is a radial section of the same in the plane of the face of one of the teeth.

My invention relates to toothed gearinghaving removable teeth, and more particularly to gearing designed for use on electric cars and the employment of non-metallic teeth; but the wheels may be used for other purposes than electric-car Works and metallic teeth substituted for non-metallic teeth wherever the wheels are used. I employ an iron core and attach the teeth to said core in such a manner that they may be readily inserted, firmly held, and expeditiously removed, the construction permitting of the removal and replacement of the teeth without unkeying the core from the shaft.

My invention consists of a gear-wheel composed of a core having peripheral open-sided kerfs or sockets with removable teeth and a clamping ring or rings interlocking with the edges of the teeth and securing the same from lateral and radial displacement.

In the drawings the iron core of the wheel is represented as consisting of the toothed circle 1, hub 2, and connecting-web 3; orin place of the continuous web 3 shown spokes may be substituted. The periphery of the toothcircle has open-sided kerfs or sockets a a formed therein either by casting or by milling. The sockets or kcrfs are separated from each other by partitions b h. In said sockets a a are received the removable teeth, which may be of varying proportions and form, according to the material of which the teeth are made, the work required, and the contour of the clamping-rings hereinafter described. In the drawings I show a tooth whose stem flares outwardly on its edges from the crown to the bottom, thus producing a dovetail enlargement of the base of the tooth, while the sides of the tooth-stem flare outward from the bottom to the crown, being thus wedge-shaped to correspond with the converging sides of the tooth sockets or kerfs.

C C designate the crown portions of the teeth. The sides of the core are made beveled to correspond with the flare or dovetail enlargement of the stems of the teeth and are flush with the edges thereof.

4 4 are duplicate clamping-rings,which are beveled, dished, or depressed on their inner surfaces to fit snugly against the beveled surfaces of the edges of the teeth, and are secured to the core by transverse bolts d cl, passing through said clamping-rings and core.

Non-metallic teeth may be made from different woods, fiber, rawhide, &c. The teeth should be made of a size slightly greater than the size of the tooth-socket, so that the clamping-rings may grip them firmly and in the case of non-metallic teeth compress them tightly in their sockets. The non-metallic teeth before being driven in are preferably coated with white lead, shellac, or other common filler.

When the crowns of the teeth are either broken down or worn off, the stems may be easily removed without disturbing the core by unbolting the clamping-rings and forcing the stems out through the sides of the sockets or kerfs.

The iron core, which gives solidity to the structure, remains upon the axle as a fixture.

Obviously one of the clamping-rings may be made integral with the core.

An essential feature of the construction above described is that the teeth are held in place by the clamping-rings, the teeth and clamping-rings being interlocked by a proj eetion or enlargement on one fittingacorrespond- IOC tion of each tooth, the teeth and clampingring being formed the one With a projecting portion and the other with a corresponding depressed portion, whereby the teeth and clamping-ring are interlocked and the teeth secured against radial and lateral displacement, substantially as described.

2. In a gear-wheel, the combination, with a core having peripheral open-sided kerfs and laterally-removable teeth with widened bases,

I of dished or depressed clamping-rings secured to the core and embracing the bases of said teeth, substantially as described.

8. A gear-Wheel consisting of a core having open-sided peripheral kerfs or sockets with removable teeth, and a clamping ring or rings interlocking with the edges of said teeth and securin g the same from lateral and radial dis placement, substantially as described.

In testimony whereof'I have hereunto set my 20 hand this 14th day of November, A. D. 1890.

ROBERT D. NUTTALL.

Witnesses:

K. T. MEAD, WM. L. PIERCE. 

